Rail assembly



FIG. 1 is a front, right, perspective view of the rail assembly embodying the new design;

FIG. 2 is a front, left, perspective view of the rail assembly embodying the new design;

FIG. 3 is a front elevational view thereof, the back elevational view being a mirror image thereof;

FIG. 4 is a right elevational view thereof, the left elevational view being a mirror image thereof;

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 6 is a front, left perspective view of the rail assembly with the rails in an extended position; and,

FIG. 7 is a front, right perspective view of the rail assembly with the rails in an extended position.

FIG. 3 shows a roller assembly in phantom lines. The roller assembly is shown for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a rail assembly, as shown and described. 